如果您想使图像变暗,请使用具有rgba 和opacity 属性的叠加元素,这将使您的图像变暗...
Demo
<div><span></span></div>
div {
background-image: url(http://im.tech2.in.com/gallery/2012/dec/stockimage_070930177527_640x360.jpg);
height: 400px;
width: 400px;
}
div span {
display: block;
height: 100%;
width: 100%;
opacity: 0;
background: rgba(0,0,0,.5);
-moz-transition: all 1s;
-webkit-transition: all 1s;
transition: all 1s;
}
div:hover span {
opacity: 1;
}
注意:我也使用 CSS3 过渡来实现平滑的暗效果
如果有人要在 DOM 中保存额外的元素,那么您也可以使用 :before 或 :after 伪......
Demo 2
div {
background-image: url(http://im.tech2.in.com/gallery/2012/dec/stockimage_070930177527_640x360.jpg);
height: 400px;
width: 400px;
}
div:after {
content: "";
display: block;
height: 100%;
width: 100%;
opacity: 0;
background: rgba(0,0,0,.5);
-moz-transition: all 1s;
-webkit-transition: all 1s;
transition: all 1s;
}
div:hover:after {
opacity: 1;
}
在图像的深色叠加层上使用一些内容
这里我使用带有z-index 的CSS 定位技术将内容覆盖在变暗的div 元素上。
Demo 3
div {
background-image: url(http://im.tech2.in.com/gallery/2012/dec/stockimage_070930177527_640x360.jpg);
height: 400px;
width: 400px;
position: relative;
}
div:after {
content: "";
display: block;
height: 100%;
width: 100%;
opacity: 0;
background: rgba(0,0,0,.5);
-moz-transition: all 1s;
-webkit-transition: all 1s;
transition: all 1s;
top: 0;
left: 0;
position: absolute;
}
div:hover:after {
opacity: 1;
}
div p {
color: #fff;
z-index: 1;
position: relative;
}